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bpf: Clarify error expectations from bpf_clone_redirect

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Commit 151e887d8f ("veth: Fixing transmit return status for dropped
packets") exposed the fact that bpf_clone_redirect is capable of
returning raw NET_XMIT_XXX return codes.

This is in the conflict with its UAPI doc which says the following:
"0 on success, or a negative error in case of failure."

Update the UAPI to reflect the fact that bpf_clone_redirect can
return positive error numbers, but don't explicitly define
their meaning.

Reported-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20230911194731.286342-1-sdf@google.com
This commit is contained in:
Stanislav Fomichev
2023-09-11 12:47:30 -07:00
committed by Daniel Borkmann
parent 9458964a6d
commit 7cb779a686
2 changed files with 6 additions and 2 deletions
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4
tools/include/uapi/linux/bpf.h
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@@ -1962,7 +1962,9 @@ union bpf_attr {
* performed again, if the helper is used in combination with
* direct packet access.
* Return
* 0 on success, or a negative error in case of failure.
* 0 on success, or a negative error in case of failure. Positive
* error indicates a potential drop or congestion in the target
* device. The particular positive error codes are not defined.
*
* u64 bpf_get_current_pid_tgid(void)
* Description